Product info sheet KC.Ex / GC.Ex
Humidity / temperature sensors

With „ATEX“ licence for locations with explosive gas atmosphere and for locations with inflammable dust
for use in atmospheric conditions

KC.Ex
seriesTechnical Data
Output 1: relative humidity

Output range 1 ........................................................ 0...100%rh
Output signal 1 ......................................................... 4...20 mA
Accuracy (MR 5...95%rh at 10...40 °C) ......................... ±2%rhat T<10 °C; T>40°C ....................... 0.1%/K additional
Output 2: temperature

Measuring element (ref. DIN IEC 751) .............. Pt 100 class B
Measuring range 2 ............................................... -20...+80 °C
Output signal 2 ......................................................... 4...20 mA(special types with special measuring range on demand)
Accuracy at 23°C ........................................................... ±0.2 K
other ranges ......................................................... ±0.3 K
at T<10°C, T>40°C ......................... ±0.007 K/K additonal

GC.Ex
seriesOthersStorage temperature ............................................. -40...+80°C
Approved operating temperature range ................. -40...+80°C
Maximum surface temperature of housing ....................... 95°C
Sensor operating voltage ........... 13...24V DC (intrinsically safe)

Description
Humidity / temperature sensors in these series are used
to measure relative humidity or temperature or relative
humidity and temperature in air and other non-aggressive gases
in explosion hazardous arears and in locations with inflammabledust.
The sensors comprise a sensor part with a sintered filter mounted
on a robust aluminium die-cast housing (transmitter part), bothmade of stainless steel.
Connection to a non-intrinsically safe electric circuit for humidity(F*C3.Ex/8) and for temperature sensors (T*C3.Ex/8) is achieved
with a 1-channel transmitter power supply unit and for the
combined humidity and temperature sensors(K*C3.Ex/8) eitherwith a 2-channel or with two 1-channel transmitter power supply
units with galvanic isolation between input-/output circuits andpower supply.

Maximum input voltage Ui ..................................... 24V DC
Maximum input amperage Ii .................................. 100 mA
Maximum input power Pi ...................................... 780 mW
Maximum inner capacity Ci ................................ negligible
Maximum inner inductivity Li .............................. negligible

Type versions - order reference

Cable between sensor and transmitter power supply unit,
shielded
Recommended type .......................... NF14 (Metrofunk)
Maximum power transmission length ................... 200 m
Maximum cable capacity ............................. 20nF/100 m
Ends of the power line: wire sleeves with plastic collars

Measured variable

GC series

KC series

F (relative humidity)

FGC3.Ex/8

FKC3.Ex/8

K (rel. humidity / temp.)

KGC3.Ex/8

KKC3.Ex/8

T (temperature)

TGC3.Ex/8

TKC3.Ex/8

weightapprox. 380 g

approx. 470 g

II 1/2G Ex ia IIC
II 2DT4

Ex tb IIIC T95°C-40°C ≤ Ta ≤ +80°C
Approved for use in explosion hazardous areas :EC Design Test Certificate
IBExU
07 ATEX 1114

Degree of protection ....................................................... IP 66
electrical equipment in instrument group II with 		protection provided by housing
Housing material
Sensor part ............................................. stainless steel
Transmitter part ............................................. alu-diecast
Cable screwing M16 x 1.5
clamping range .................................................. 3...7 mm
initial torque(for recommended cable type) ............................ 4.0 Nm

Recommended transmitter power supply units
by Hans Turck GmbH & Co. KG
IM33-11Ex-Hi/24V DC (1-channel)
IM33-22Ex-Hi/24V DC (2-channel)
All data and certificates at www.turck.com
Conformity with European Standards
Explosion protection guideline 2014/34/EU
General requirements ......................... EN 60079-0:2012
Intrinsic safety „i“ ............................... EN 60079-11:2012
Category 1G electrical apparatus ....... EN 60079-6:2007
Dust protection by enclosure „t“ ........ EN 60079-31:2009
Directive about electromagnetic compatibility ... 2014/30/EU
General requirements ......................... EN 61326-1:2013
Special requirements ....................... EN 61326-2-3:2013

This information is based on current knowledge and is intended to provide details of our products and their possible applications. It does not, therefore, act as a guarantee of specific properties of the products described or of their suitability for a particular application. It is our experience that the equipment may be used across abroad spectrum of applications under the most varied conditions and loads. We cannot appraise every individual case. Purchasers and/or users are responsible forchecking the equipment for suitability for any particular application. Any existing industrial rights of protection must be observed. The perfect quality of our products isguaranteed under our General Conditions of Sale. Issue June 2016 KCGC.Ex_E. Subject to modifications.

Product info sheet KC.Ex / GC.Ex page 2

Dimensions
Dimensionsof clearanceholes
2 x Ø4,868

75

6352

View rotatedby 180°Humidity/temperature
sensors are exclusively designed for stationary use.
The electrical connectionmust only be carried out by
properly qualified personnel

6380ca. 208

clamping range
Ø 3 ... 7232 *)Ø15111

Ø15KC3.Ex/8(for duct mounting)57

GC3.Ex/8*) special type with sensor length 290 mm on demand(for wall mounting)

Assembly instructions
Humidity / temperature sensors should be installed in alocation which is representative for measuring the environmentalconditions.
Connection to a non-intrinsically safe power circuit is achievedby using either one or two transmitter power supply units (U0, I 0,P0) according to the connection diagram. To verify the intrinsic
safety in a simple, intrinsically safe electric circuit, the values of
the intrinsically safe equipment (Ui, I i, P i, C i and Li), of the corresponding electrical equipment (transmitter power supply U0, I0,P0, C0 and L0) and of the cable (C und L) need to be compared
to ensure that the intrinsically safe equipment is not overloaded
and the energy stores L and C are not greater than L0 and C0 of
the corresponding equipment. For the performance, even with a
trapezoidal characteristic curve, the value P0 of the transmitter
power supply is to be used.
Basically, the max. cable length only depends on C0 of thetransmitter power supply and on the type of cable used, as
circuit engineering measures have been taken to ensure thatthe internal capacity of the sensor does not impact externally.
We recommend the cable type NF14 and a max. cable lengthof 200m.
During installation, the additional requirements for the protection

type „i“ - intrinsically safe according to DIN EN 60079-14, must
be complied with. Only fixed cables and electric lines may beinserted into the cable gland. After connecting it up, the housing
must be sealed tightly again. To do so, the screws in the covermust be tightened with a torque of 1.5 to 2.0 NM.
The intrinsicaly safe humidity and temperature sensors (type ofprotection „ia“) can also be used as class 1 equipment. If you do
this, make sure you only use assembly kit ZA40 when attaching
the sensor to a partition barrier.
Please order assembly kit ZA40 separately!
Please refer to pages 3 and 4 for further safety advice anddimension diagrams for connecting to zone 0.
The sensor can be installed in any position. However, do avoid positions where water ingress can occur. Dew formationand splashes do not damage the sensor, although corrupted
measurement readings are recorded until all the moisture on
and directly around the sensor element has dried up.
In order to maintain immunity from interference while using thesensor, you are required to connect up the sensor with a screened cable which has been fitted into the sensor‘s EMC cablegland by a qualified electrician.

Connection diagrams
Safe areaArea where there is arisk of explosion

operating voltage
19...29 V DC

121110RL ≤ 500 Ω

output temperature
4...20 mARL ≤ 500 Ω

output humidity
4...20 mA

operating voltage
19...29 V DCRL ≤≤ 500
500 ΩΩRL

121110

98
7

6
54

32
1Sensors 2 channele.g. types
KGC3.Ex/8
KKC3.Ex/8

98
7

6
5
4

32
1

Sensors 1 channel
FGC3.Ex/8
FKC3.Ex/8
TGC3.Ex/8
TKC3.Ex/8

outputoutput4...204...20mAmA1) Connection for sensors with humidity output
2) Connection for sensors with temperature output

Product info sheet KC.Ex / GC.Ex page 3
Installing a humidity and temperature sensor with connection to zone 0
The Humidity/temperature sensor is to be mounted in thewall of the hazardous area with class 1 requirements by using
assembly kit ZA 40 and according to the dimension diagram
showing connections to zone 0 on page 4, .
This partition barrier must be made of corrosion-resistant material compatible with the application, must be homogenous andhave a wall thickness of at least 3 mm, and must have a threadof M25x1,5.
Otherwise additional protection measures are necessary in accordance with DIN EN 60079-26 .
When the sensor is removed there is a danger of releasing
potentially explosive atmosphere and flames p enetrating fromthe outside. For this reason the opening must be closed again
immediately.
Only attach the humidity and temperature sensors using the increased safety-type cable gland provided in the assembly kit ZA 40.
Please order assembly kit ZA 40 separately.
The screw connections are to be tightened using a tool with atightening torque of 10 Nm.
When removing the sensor, the increased safety-type cable glandstays in the partition barrier. The opening is closed again by simply
replacing the normal seal insert with the increased safety-type
filler seal insert from the assembly kit ZA 40.
Special models
On request Humidity/temperature sensors with „Ex“certification can also be supplied with the following options:
Connecting cable Ø 6...10 mm

all model versions

stainless steel/teflon filter ZE28
for extreme applications

all model versions

290 mm long sensor tubeseries KC

Special measurement ranges
Temperature(0 ... 50°C and 0 ... 100°C)

with model versions
K*C3.Ex/8 andT*C3.Ex/8

Maintenance and Cleaning
If used as intended and if the assembly instructions and ambientconditions have been taken into consideration, then no runningmaintenance is necessary.
In order to arrange a simple test of the functionality of the sensor on the site, we recommend the MELA®-humidity standard
type ZE 31/1 with the additional adapter type ZE 33 (productinformation no. F 5.2).
Dust does not damage the sensor but it negatively affects its
dynamic behaviour.
The sintered filter can be carefully unscrewed and washed out if
too much dust accumulates.
Loose dirt can also be removed from the measuring element byblowing or carefully flushing with distilled water. The sintered filter
should be in an absolutely dry condition when it is screwed on
again in order to avoid measurement errors. It is important not
to touch the highly sensitive sensor element in the process. The
screw connection on the sintered filter has to be firmly tightened.
Please refer to the application instructions for the sensing
elements (product info sheet no. A 1) or check with the manufacturer for further information that you need to be aware of whenusing humidity sensors with capacitive sensing elements.
Caution!
Do not open sensors in a location with explosive dust atmosphere!

RepairHumidity and temperature sensors with „ATEX“certification may only ever be repaired by the manufacturer.
The manufacturer will only use type-tested components asreplacement parts.
While observing the following safety advice, the customer isonly allowed to recalibrate the sensors.
Safety Information
The sensor may only be opened and operated while open
when it is not in the potentially explosive atmosphere.
After calibration, the housing must be sealed tightly again.
To do so, the screws in the cover must be tightened witha torque of 1.5 to 2.0 NM.
Potentiometer assignments

HslopeH+
H-offset

Types: FGC3.Ex/8; FKC3.Ex/8

T
H

slope
offset
slope

T+
T
H+
H-offset

Types: KGC3.Ex/8; KKC3.Ex/8

T

slope
offsetT+
T-

Types: TGC3.Ex/8; TKC3.Ex/8

Product info sheet KC.Ex / GC.Ex page 4Dimension diagrams for connection to zone 0Zone 1Zone 1partition barrier

thread M25x1.5(requirement for
category-1G electricalapparatus according
to DIN EN 60079-26)t≥3

L 2max = (111 - L 1min - t) =73

Zone 0series

L 2max = (232 - L 1min - t) = 194

assembly kit(ZA 40)L 1min =35t≥3(requirement for
category-1G electricalapparatus according
to DIN EN 60079-26)

assembly kit(ZA 40)L 1min =35

partition barrier

thread M25x1.5

Zone 0GC3.Ex/8

KC3.Ex/8(for wall-mounting)(for duct mounting)clamping range
Ø 11.5 ... 15.5

Assembly kitZA 40
for connection to zone 0(please order separately)

!

7.521

SW 24
SW 28

M 25x1.5"increased safety" typecable glandfor sensor mounting inpartition barrier

Ø17

seal insert, closed
to close the opening in
the partition barrier after
removing the sensor

Electrical connections must only be carried out by properly
qualified personnel.
Attention must be paid to requirements for category -1G electricalapparatus according to DIN EN 60079-26 and also to installation
advice.
When the sensor is removed there is a danger of releasing
potentially explosive gas mixtures and flames penetrating fromthe outside.